Oven furnace



May 23, 1939. W R, HQNES 2,159,480

OVEN FURNACE Filed May 25, 1938 2 Sheets-Sheet l ATTORNEY.

Patented May 23, 1939 PATENT ori-lcs OVEN FURNACE j William R. Hones, Baldwin, N. Y., assigner Yto Charles A. Hones, Inc., Baldwin, N. Y., a corporation of New York Application May 23, 1938, Serial No. 209,430

3 Claims.

This invention relates to an oven furnace.

The object of the invention is the production of a furnace by means ofwhich high temperatures can be obtained with atmospheric burners that .do .not require high pressures.

The second object of the invention is the production of a furnace to heat treat steels or heat other materials, with burners that depend on the pressure in the mains, often as low as two inches of water column to induce the air into the furnace for combustion.

vOther objects will be apparent from the specification and claims.

In the accompanying drawings Fig. l represents a front view of an exempliflcation of the oven furnace; Fig. 2 shows a right hand view of Fig. l partly broken away; Fig. 3 indicates a top View of the furnace; Fig. 4 represents a section of Fig. 1 on line 4, 4; Fig. 5 shows a. section of Fig. 2 on the line 5, 5; Fig. 6 is a section of Fig. 2 on the line 6, 6; Fig. 7 is a partial front View of the furnace with a modification; Fig. 8 shows a partial section of Fig. '7 on the line 8, 8 and Fig. 9 indicates a partial top view of Fig. 7.

'I'he oven furnace in this exemplication is Aindicated to comprise the following.

l The shell'of the furnace is shown with its front p'iate 29 and its rear plate 50.

The front plate 20 has integral with its top and bottom ends the flanges 2l and 22. Side flanges for .the front plate 29 are shown at 23 with the projecting lugs 24. Front legs 28 extend from the lower ends of thev front plate. A furnace door opening Bil is indicated in the plate 20 and is shown with horizontal fianges 3! and Vertical iianges 32 which form the bead 33 for the front plate.

A horizontal ange 43, extends from the rear face of the front plate 20, and a shelf bracket t5 extends from the front face thereof.

The rear plate 58 has integral therewith the top flange 5l and the b-ottom ange 52, which are connected by the side flanges 53. An opening 54 is shown in the plate 55. A rear leg 58 extends rfrom the bottom flange 52. Projecting lugs 59 extend from the flanges 53. A horizontal flange 93 extends from the inner surface of the rear plate 59. A clampingr rod extends through each pair of projecting lugs 24 and 59 which with their threaded ends and nuts as shown maintain the plates 2E) and 59 in operative position. A supporting plate G6 with the opening 61 is supported on the flanges 43 and 63.

The heating chamber for the furnace is indi- Qcated at 10. The walls of the heating chamber are composed of insulating fire brick of medium heat storage and low conductivity. 'I'hey have low expansion characteristics because of the high temperature required in the furnace. g

'Ihe heating chamber 10 of the furnace comprises the side walls 13, with the conduits 14, at the lower portions of their inner faces, the said conduits having the upper deflecting faces 15, latter incline upwardly toward the axial center of said heating chamber. The conduits 14 provide a large volume for the combustion of the gases in the heating chamber, and also deect the said gases to prevent them flowing straight upwardly along the side walls of said heating chamber, during their flow out of said furnace and before impregnating the objects treated in the heating chamber. y

'Ihe bottom wall of the heating chamber 10 is indicated at v"lli with the opening "l1, which latter with opening 61 produces a passage for the introduction of the required volume of air into said heating chamber 'l0 to support combustion.

The top wall of the heating chamber 19 is indicated at with the inclined lower faces 8| and the upper projection 83 with the outlet flue 84.

The rear wall of the heating chamber 19 is indicated at 85 with the opening 8l extending therethrough. 'I'he front Wall of the heating chamber is shown at 88.

At the upper end of the heating chamber lll is indicated the triangular shaped hood 92, the ends 93 of which extend into the side walls 13. The upper converging faces 94 of the hood 92 form with the faces 8| of the top wall of the heating chamber the convergingoutlet conduits 95.

The upper and smaller ends of the conduits 95 join with the outlet flue 84.

The sizes and shapes of the outlet conduits 95, are important for holding back the gases of combustion until they have imparted their heat to the heating chamber and its contents. The two conduits 95 are provided to evenly heat the front and rear of the heating chamber. The hood 92 also functions as a heat deector. The hood 92 with its conduits 95 function to produce an equilibrium or evenness of temperature in the heating chamber 19, which is important and essential to thesuccessful operation of the furnace.

The fire brick walls of the heating chamber 1l! are covered by insulating walls preferably of magnesia content, and are indicated with the side members |00, the rear member IUI having the opening 192 and the top member |93. The top and side members of the insulating Walls are covered by the jacket |05 of sheet steel. The said jacket prevents heat loss, and is not heated to a high temperature which would result in poor working conditions, and subject the operators of the furnace to burns. A flue |06 extends through the jacket |05 and connects with the flue 84.

The opening 30 of the front plate 20 of the furnace is provided with the door having the front wall H with the rearwardly projecting flanges |H and H2. 'I'he latter bear against the bead 33 of the opening 30 when the said door is closed. The door between its anges lil and H2 supports a block H5, which may comprise a number of members, of insulating fire brick of the same material as described for the walls of the heating chamber 10. The said block H bears against the front wall H0 of the door and projects beyond its flanges. ends of the block H5 bear against the adjacent flanges 3| of the plate 20, and its side'faces H6 are tapered to allow ythe door to be easily swung to its open or-closed position. A handle H8 is provided for the wall I I0 to easily swing the door. To the front wall H0 of the door of the furnace are fastened a pair of U shaped brackets |20 having the-horizontal members |2| and |22. The front plate 20 of the furnace has fastened thereto tne pair of brackets |25 by means of screws Vber |33 of each hinge rod extends through openings in the horizontal members 2| and |22 vof the brackets |20. The members |32 of the hinge rods are vertically supported by the nuts |36, and the brackets |20 with the nuts |38 supportthe members |33 of the hinge rods. By means of the handle H8 and the hinge rods, the door having the front wall H0 can be easily positioned in its open position, see Fig. 1, as indicated in dotted lines, distant from the furnace door opening 30.

Upon the flanges 22 and 52 of the front plate 20 and rear plate 50 respectively of the furnace,is supported the burner supporting plate |45. Upon the plate |45 are supported a plurality of Venturi Bunsen burners 46, operating at slightly above the atmospheric pressure and which are connected by the connecting portions |41, and have integral therewith the flanges |48 and the `latter are bolted to the plate |45. The valve for each burner is indicated at |49. The outlet endsr of said burners lead to the openings 61 and 11. It will be noted that each of the burners is tted with an inspirator. When the burners are functioning the openings 61 and 11 permit a proper volume of air to mix withy the outlet fuel of said burners for combustion.

A supply pipe for fuel for the burners is shown at |50.

A table or hearthv |5| for supporting the material to be treated and of highly refractory material,v preferably of carborundum and the like, is supported upon the bottom wall 16 of the heating chamber 10. The sides of said hearth are opposite the conduits14 of the side walls 13.

Thetop and bottom A pyrometer |55 is shown with the tube |56, which latter extends through the opening 61 of the rear wall 85 of the heating chamber 10 and the wall |0|.

Referring to Figs. 7, 8 and 9 a modified door with its appurtenances is indicated. The front plate 20 of the furnace is again shown with its projecting lugs 24 and the pyrometer is again indicated at |55. The side walls of the heating chamber 10 are again indicated at 13 and the side members of the insulating wall are again indicated at |00.

A'pair of similar supporting and guide brackets each indicatedin its entirety by the numeral |60, are secured to the front plate 20 of the furnace. The said plate 20 is indicated with furnace door opening 3|a, with its bead 33a. Each of the brackets |60 comprises the plate |65 which has spaced therefrom the parallel members |66 and the parallel members |61 at right angles thereto; forming the runways |68 and the runways |69 at right angles to one another. The door of the furnace is indicated atY |10 with the anges I1! and |12 at its edges. From the top of the door |10 extend the guide pins |13 and from the bottom of the said door extend the guide pins |14. A handle for the door |10 is indicated at |18.

The door |10 is opened by engaging the handle |18 and pulling it forwardly, by reason of which the door will be opened with the guide pins |13 and |14 sliding in the runways |68.

Next the said door |18 is pulled in a direction parallel to the front ofthe furnace with the said guide pins sliding in the runway |69, until the door |10 is positioned to one side of the furnace door opening. The plate 65 of the lower bracket |60 functions as a shelf for transferring the objects treated into and out of the heating chamber |10 of the furnace.

' During the operation of the furnace the flames from the burners |46 impinge against the lower face of the hearth |5|, upon which the objects being heated are placed. The products of cornbustion impinge against the walls ofthe conduits 14 and are deflected toward the middle of the chamber 10 above said hearth. The conduits 14 provide a large area for combustion adjacent to the objects being heated, deflect the gases and retard their speed to eiiciently heat said objects.

Various modifications may be made in the invention and the present exempliiication is tobe taken as illustrative and not limitative thereof.

Having described my invention I claim:

l. In a furnace the combination of a front plate having a furnace door opening, a door for said opening, a rear plate for the furnace, brick of refractory material between said plates forming a heating chamber, U shaped brackets having upper and lower horizontal members extending from the outer face of said door, and spaced from each other, brackets spaced from each other extending from the front plate of the furnace, each of the latter brackets having projecting therefrom an upper and a lowed lug, a pair of hinge rods each comprising an upper vertical member with a nut at its upper end, a lower vertical member for each hinge rod with a nut at its lower end and a horizontal member for each hinge rod connecting its vertical members, the upper vertical members of the hinge rods extending through openings in the lugs of the brackets of thefsaid front plate and the lower vertical members of the hinge rods extending through openings in the horizontal members of the U shaped brackets of said door, the nuts at the upper ends of the upper vertical members of the hinge rods bearing on the lugs of the brackets extending from the front plate of the furnace and nuts at the lower ends of the lower vertical members of the hinge rods bearing against the lower hori zontal members of the U shaped brackets.

2. In a furnace the combination of a heating chamber having side Walls with conduits at the lower portions of their inner faces, said conduits having upper deecting faces which incline up- Wardly toward the axial center of the heating chamber, said conduits providing a large Volume for the combustion of the gases in said heating chamber and deectng said gases toward the central vportion of said chamber, said heating chamber having a front wall, a rear wall, a top wall with a ue extending therethrough and having inclined faces on its bottom side, said chamber having a bottom wall with an opening, a triangular shaped hood at the upper portion of the heating chamber having inclined upper faces, the latter spaced from the inclined faces of the top wall and forming converging outlet conduits therewith and leading to the flue in the top wall, and a hearth for material to be heated supported upon the bottom wall of the heating chamber over the opening in said bottom walls, the sides of said hearth opposite the conduits in the side walls of the heating chamber and means to heat the said heating chamber at a low pressure.

3. In a furnace the combination of a front plate having a furnace door opening, a door for said opening, a rear plate for the furnace, brick of refractory material between said plates forming a heating chamber, brackets extending from the outer faces of said door and spaced from each other, brackets spaced from leach other extending from the front plate of the furnace, a pair of hinge rods, each comprising an upper vertical member with supporting means at its upper end, a lower vertical member for each hinge rod and a nut at the lower end, and a horizontal member for each hinge rod connecting its vertical members, the upper vertical members of the hinge rods extending through openings in the brackets of said front plate and the lower vertical members of the hinge rods extending through openings of the brackets of said door.

WILLIAM R. HONES. 

